I played the demo for UFC yesterday and I have to say that it is pretty fun. I submitted chuck liddell with Shogun Mauricio Rua in the first round by rear naked choke.

yup, i downloaded the demo on the weekend and gave it a whirl.
the tutorial alone took me about 45 minutes... it is pretty deep.
i fought 3 matches as Liddell and each time i whoooped Rua a different way.
KO, ref stoppage, submission... its awesome!!!
i am definitely buying it when its released - may 19.